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I had issues getting mine to line up at all in the USDM casings, so I just used the JDM mirror externals as well. For the wiring, you don't need to add any relays or additional hardware. I had to take mine apart last year when I did this swap, because my switch didn't come with a wiring harness, so I had to follow the traces and match their functions with the stock switch. I'll see if I still have the wiring diagram I made around here, but if you have the harness, I think there's a post floating around that matches up the colors in the USDM harness with the JDM switch harness. 
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